CAS AS 102 Chapter Notes - Chapter 2: Celestial Equator, Constellation, Night Sky
Document Summary
Saturn"s rings are 270,000 km across: 1 light-year = 10x10^12 km, 100,000 light years = 9. 46 x 10^17km, (9. 46x10^17km)/(2. 7x10^5km)=3. 5x10^12 = 3. 5 trillion times, how many seconds are in a year, 1 year = 3. 1536 x 10^7s i. What is 10^7 in terms of millions and billions: 10 million, 0. 01 billion = 10^-2 billion. Galaxies are carried along with the expansion of the universe. The farther away the galaxy, the faster it moves away from us. We don"t feel like we"re rotating and revolving because the speed is not changing. With naked eye we can see more than 2000 stars & milky way. A region of the sky with well-defined borders. Stars in a particular constellation appear to lie close to one another but may lie at different distances from earth. Our depth perception is breaking down at larger distances. Stars at different distances all appear to lie on the celestial sphere. The 88 official constellations cover the entire celestial sphere.
